Bank Of England Dollar 8R Overstrike. Lima Undertype ?

I agree with realswatcher - die element position is no guarantee of mint identification. A better clue would be use of one of the distinctive fonts for a numeral or a letter. The difference usually requires a fairly complete figure and familiarity with mint products. The 9 used at Mexico City is different from Lima or Potosi so that is a good one. At times the 6 is variant. There are others but not as definitive since the year would have to be known.

From what I have read - virgin planchets for both the 960 Reis and Bank of England issues are scarcer than the overstrikes unless you are referring to Heraldic US dollars, some of the issues from Europe and of course very rare originals from South America. There is NO premium at all for the big three mints Mo, Pts or Lima the last I new, unless the 4 digits of the date are clear, mint mark is clear and BOTH assayer initials are visible. Of course people who have not spent time studying the series may pay a premium because they no not know better.